//package StringJioner_;
//import java.util.StringJoiner;
//
//public class zuoye {
//    public static void main(String[] args) {
//        String[] fields = {"name", "position", "salary"};
//        String table = "employee";
//        String select = buildSelectSql(table, fields);
//        System.out.println(select);
//        System.out.println("SELECT name, position, salary FROM employee".equals(select) ? "测试成功" : "测试失败");
//    }
//
//    static String buildSelectSql(String table, String[] fields) {
////        var sj=new StringJoiner(", ","SELECT "," FROM "+table);
////        for(String field:fields){
////            sj.add(field);
////        }
////        return sj.toString();
//    }
//}